23
Fuel and Oil Recommendations
Engine Maintenance
Fuel must meet these requirements:
Clean, fresh, unleaded gasoline.•
A minimum of 87 octane / 87 AKI (90 RON).•
Gasoline with up to 10% ethanol (gasahol) or up to 15% •
MTBE (methyl tertiary butyl ether) is acceptable.
NOTICE: Do not use unapproved gasoline, such as E85. Do
not mix oil in gasoline or modify the engine to run on alter-
nate fuels. This will damage the engine components and void
the engine warranty.
To protect the fuel system from gum formation, mix a fuel
stabilizer into the fuel. All fuel is not the same. If starting
or performance problems occur, change fuel providers
or change brands. This engine is certifi ed to operate on
gasoline. The emissions control system for this engine is EM
(Engine Modifi cations).
High Altitude
At altitudes over 5,000 feet (1524 meters), a minimum 85
octane / 85 AKI (89 RON) gasoline is acceptable. To remain
emissions compliant, high altitude adjustment is required.
Operation without this adjustment will cause decreased per-
formance, increased fuel consumption, and increased emis-
sions. Operation of the engine at altitudes below 2,500 feet
(762 meters) with the high altitude kit is not recommended.
Oil must meet these requirements:
Briggs & Stratton warranty certified oils are highly •
recommended for best performance.
Other high-quality detergent oils are acceptable if classified •
for service SF, SG, SH, SJ or higher.
Do not use special additives.•
Outdoor temperatures determine the proper oil viscosity
for the engine. Use the chart (Figure 15) to select the best
viscosity for the outdoor temperature range expected.
Figure 15
Maintenance Chart
First 5 Hours
Change oil•
Every 8 Hours or Daily
Check engine oil level•
Clean area around muffler and controls•
Clean finger guard•
Every 25 Hours or Annually
Clean air filter*•
Clean pre-cleaner*•
Every 50 Hours or Annually
Change engine oil•
Check muffler and spark arrester•
Annually
Replace air filter•
Replace pre-cleaner•
Replace spark plug•
Replace fuel filter•
Clean air cooling system*•
*In dusty conditions or when airborne debris is present, clean more often.
Combustion Chamber
Remove combustion chamber deposits every 500 hours or
whenever the cylinder head is removed.
With the piston at Top Dead Center (TDC), scrape deposits
from top of piston and upper bore with a plastic scraper.
Remove the loosened deposits from around the top ring
land area using compressed air or a shop vacuum and a soft
bristle brush.
NOTICE: Use care to prevent debris from entering push rod
or oil return cavities in cylinder. Do not damage bore, top of
piston, cylinder head, or cylinder head gasket surfaces.
It is not necessary to remove the discoloration marks on the
piston, valves, and/or cylinder head. These marks are normal
and will not affect engine operation.
Combustion Chamber
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